So, when their focus is on adding extension to the delivery and trying to “reach out”, trunk rotation suffers. Because the pitcher is focused on arm extension (the idea of “reaching out”), his body exaggerates that action and forgets that upon landing the trunk must begin rotation followed by flexion in order to maximize all transferred energy so the arm gains maximum velocity.

Your next indoor baseball practice is a great place to train your accuracy with a helpful and effective drill from the mound. To run this drill, you’ll need a catcher and an additional teammate to stand in the batter’s box. Your teammate should be carrying a bat and wearing a batting helmet, but they won’t be swinging at any pitches. Instead, they’re serving as a point of reference for your aim.

The innovator of the slider is debated, but some credit Chief Bender as the first to use the slider, also George Blaeholder was credited with using it with the St. Louis Browns then called a "nickel curve", in the 1920s.[6] Others have also credited George Uhle with developing the pitch.[7] Bender used his slider to help him achieve a no-hitter and win 212 games in his career.[8] Bender was the first pitcher to win six World Series games.[6]
Strictly speaking, a curveball breaks more in the vertical plane than horizontally. Curveball masters can throw a “12–6” (think clock), purely vertical and do it anywhere from 70–90mph. More commonly, the ball drifts from 1–7ish, 2–8ish. If a ball breaks more laterally (horizontally), ie. 3–8, then it’s a slider, but thrown faster than a curve (80mph territory). If it just breaks laterally at more or less fastball speed (80–90), then it’s a cutter.
To start, righties should take their sign from their catcher from the right side of the rubber, lefties from the left (No. 1). Take a controlled, small step back keeping the weight of the upper body over the pivot leg (No. 2). Turn your hips to the catcher and lift your lead leg from the knee into the balance position (No. 3). Do not swing the lead leg into the balance position, it's simply a "lift."
B) Twist or snap your wrist: In this brief pitching video I explain this myth in greater detail. If you twist your wrist right before release of the baseball you will experience elbow problems in the long run. In fact, you will know that it is wrong to throw the ball like this to begin with because your arm will tell you it’s wrong. Why do pitcher’s continue to throw like this? Again, this method works for some pitcher’s because it does impart rotation on the ball. The wrong rotation, but pitchers find success with it so they continue to use it.
It's always best to learn proper pitching mechanics early -- and then continue to refine those mechanics as a player gets older and advanced in the game of baseball. This starts in little league. These little league pitching drills can be used as a teaching and training tool to promote and develop proper pitching mechanics. Each little league pitching drill focuses on a specific aspect of the pitching delivery, allowing the pitcher to develop a feel for good mechanics that directly translates into better consistency in games, more strikes and increased pitching velocity.

The most fundamental property of any pitch is its speed. In the graph below, the speed is shown on the vertical axis. Looking at pitches thrown by Zack Greinke of the Arizona Diamondbacks in a game against the Dodgers last year, we see that there are some leisurely ones (curveballs, denoted by pink symbols) and some electric ones (fastballs, marked by red and green symbols):

6. Arm speed: It is extremely important that you maintain similar arm speed with your curveball that you have with your fastball. A hitter reads arm speed. The matter of arm speed is obviously more important with a changeup than it is with a curveball, but it’s important for other reasons. Another way to get a tight rotation and hard downward movement with a curveball is to throw it with quicker arm speed. If two pitchers have the exact same curveball grip, mechanics, release, etc. but one throws it with quicker arm speed, the one with quicker arm speed will throw the curveball with more break, and thus the harder pitch to hit.
Your next indoor baseball practice is a great place to train your accuracy with a helpful and effective drill from the mound. To run this drill, you’ll need a catcher and an additional teammate to stand in the batter’s box. Your teammate should be carrying a bat and wearing a batting helmet, but they won’t be swinging at any pitches. Instead, they’re serving as a point of reference for your aim.
Does your son or daughter have slider spin when throwing a fastball? A common problem in youth baseball is not informing kids that slider spin on a fastball is not ideal for throw/pitch efficiency. How can you identify if your son or daughter has slider spin on the ball in their throws? First thing is knowing what you are looking for when you’re playing catch in the backyard. If your son or daughter is a righthanded thrower, the first good indicator of slider spin is YOU may be catching the ball on the right side of your body consistently pulling the throws across your body. A slider has a clockwise rotation and spins on an axis that faces to player indicated by the blue line in the gif below. When playing catch you will be able to identify slider spin by seeing a circle in the middle of the ball. For righty or lefty throwers a 4 seam fastball should have close to perfect vertical spin/12 o’clock to 6 o’clock spin. A 2-seam fastball’s axis, in comparison to a righty, points towards 11 o’clock. For young kids slider spin when throwing a 4 seam fastball is not horrible for them but can become a bad habit to break. Plus we want to have the correct spin on the ball, especially as a pitcher. In this article, we will identify slider spin, what causes it, and how we can help eliminate it from 4 seams and 2 seam fastballs.

Start with the hands together, ball in the glove. The legs are positioned in the exact same manner as the high-cock drill, toes of the lead leg facing the target. The legs remain in this permanent, shoulder-width-apart position throughout the drill. However, the back foot will pivot onto its toes when the ball is released (like when you pivot your back foot during a golf swing or baseball bat swing). However, the distance of the two feet remain the same.